To repair a leaking waste drain pipe beneath your sink, start by placing a bucket underneath to catch wastewater, then unscrew the leaking slip-joint nuts. Inspect the internal rubber washers; if they are degraded, flattened, or cracked, replace them immediately with new gaskets. Ensure the beveled edge of the rubber washer faces the correct direction toward the fitting before hand-tightening the nut securely. If the pipe wall itself is cracked or split, the entire section must be replaced with a new PVC kit. Verification: Run the faucet at full volume and check all joints with a dry paper towel to confirm zero leaks.
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